Vacuum breaker



Nov. 9 ms., R FLINT 2,453,125

' VACUUM BREAKER Filed Deo. 1, 19,45

Patented Nov. 9, 1948 VACUUM BREAKER Charles R- Fliilt. La Porte, inde assigner tol The Deluxe Products Corporation, a corporationof Indiana Application December 1, 194.5, Serial No1 632,158

7 Claims.

' This invention relates .to a vacuum breaker, and

more particularly to an automatic vacuum actualed .device for breaking a vacuum in the idle well i a carburetor on an internal combustion engine` The .present invention is intended primarily for operation .during deceleration of an automotive vehicle. Deceleration refers to the operation during which the engine is operating at a higher rate of. .speed than its carburetor throttle opening Would permit if it were working under its own power, A kdiscussion of this problem will be found in. mv Ratent 2,267,020, issued December 23, 1941. ln ,that patent electrical means is shown for pro- Vidingan auxiliary controlled `flow of air to the idle. Well of the carburetor during deceleration.

The present invention comprises a mechanical system controlled by the vacuum of the manifold itself jfor operating `such an auxiliary flow of air and for maintaining it after the vacuum has fallen due to the admission of the auxiliary air. The present invention also produces an auxiliary flow of air to the manifold which furnishes fresh air thereto during operation of the device.

in its preferred form the. control. mechanism comprises a vacuum actuated piston having an auxiliary booster chamber which is under vacuum only after actuation of the primary valve.

The. invention is illustrated in the drawings in which,

Fig. 1 is a fragmentary sectional elevation; and

Fig, 2 is a section taken along'the line 2-.-2 in Fig. 1.

The device is operated in connection with an automotive engine of any form, which is not illustrated, The device is mounted adjacent the intake manifold IIJ of such an engine, adjacent the carburetor I I. The carburetor is of any suitable form and has a conventional idle Well opening i2. An auxiliary opening I3 is provided which provides a communication between the chamber I4 :andthe idle Well. A vent `I5 is provided from this chamber to the atmosphere. The chamber I4 is closed by the housing I6 which is divided by the diaphragm Il into chamber I4 and outer chamber I8. The diaphragm is normally pressed by the spring I9 against a needle valve 20 which normally closes the passageway I3.

Chamber I8 is connected by the line 25 to the booster chamber 26.

The actuating mechanism for the needle valve 20 is the valve 30. This comprises a neck 3I suitably attached to and communicating with the manifold I0. The neck communicates with the primary vacuum chamber 32 which is normally closed bv the .disk valveSS which seats on. thev valve .seat 34... The. disk 33 is nreferablrof regular polygonal shape with rounded corners as shown Fig. 2- A disk of this shape ,is sel-f oentering and at the same time provides `cl'iannels rfor the passage of air around the disk..

disk is mounted on the plunger 3.8 and. is normally pressed against the valve seatby a spring Sl. The plunger 3.6 passes through the boosteror secondary vacuum chamber 2t rand .at itsupper end carries the booster valve 4.0 which is vci substantially greater diameter than the opening .3.5i in the valve seat 34. The disk All is preferably square with rounded corners like disk 33. immediately above the disk 40 is an opene ingii; having a depending lower edge which forms a Valve seat 43. .disk dil, however, does not Seat itself upon this valve seat, but there is ya small clearaiie, plieferably aboutilOl" when the valve disk is at v`its uppermost position. A stop.

44 prevents the valve from opening too far. The opening 4Z communicates with the atmosphere in any `suitable manner, preferably throughy a filter 4 5.

The strength of the spring 3l, and the sizeofr 2d is under atmospheric pressure.

Whenever the vacuum rises within valve chamber 32 to such an extent as to cause the Valve to open, the pressure Within the chamber 32 is raised and if it were not for the effect of atmospheric pressure on the secondary Valve disk 40, the valve assembly would immediately close. However, pressure within the secondary valve or booster chamber 25 is likewise reduced as soon as the valve opens because the opening to the atmosphere through the annulus 4I is restricted. Therefore, the pressure of the atmosphere upon the disk 40, which is greater in area than the opening 38, tends to keep the valve open. The area is preferably adjusted so that the valve opening at 211/2 of vacuum will not close again until the Vacuum in the intake manifold has fallen to 15 of mercury.

The creation of a vacuum in the chamber 26 communicates itself to the diaphragm I1 and opens the needle valve 20, thereby permitting aasai 3 air to enter the idle well of the carburetor so long as the valve 30 is open.

The device may be further improved by providing an opening '56 in the wall of chamber 26, which opening is closed by a valve or pad 5I mounted on a crank arm 52. This arm is connected to the accelerator pedal by any suitable mechanical means, not shown, and is actuated simultaneously with the throttle so that as soon as the throttle is opened slightly the valve 5l likewise opens.

The use of a valve 5I has the advantage that the boosting eieot of the chamber 26 is eliminated as soon as the throttle opens. In the absence of a structure such as that as the opening 50 and the valve 5I there are certain conditions under which sudden opening of the throttle will cause a surge in the motor, which surge is eliminated by the use of the valve 5l.

The foregoing detailed description has been given for clearness and understanding only, and no unnecessary limitations should be understood therefrom.-

' What I claim as new and desire to secure `by Letters Patent is:

1. In the combination including an automotive vehicle having an internal combustion motor, means comprising a carburetor, an intake manifold connected to the carburetor, a throttle valve between the carburetor and intake manifold, a vent communicating with the carburetor, a closure for said vent, means normally actuating Said closure into closed position, vacuum means for opening said closure, said vacuum means including a vacuum booster chamber connected to the intake manifoldthrough a valve seat, a valve normally closing said seat, resilient means urging said valve upon said seat, and a secondary valve providing restricted communication between said booster chamber and the atmosphere and rigidly connected to said iirst valve.

2. yApparatus as set forth in claim 1 in which the secondary valve has a closure area much greater than the closure area of the said valve seat.

3. Actuating mechanism for the relief of vacuum in the carburetor of an internal combustion engine having an intake manifold comprising -a primary vacuum chamber in open communication with the manifold, an openingr in said chamber, a closure for said opening, resilient means normally urging said closure against said opening, a secondary vacuum chamber in communication with said primary vacuum chamber through said opening, a secondary closure providing restricted communication between said secondary vacuum chamber and the atmosphere, said secondary closure being mounted in spaced relationship to the first closure, and a diaphragm valve communicating with said secondary vacuum chamber and said carburetor.

4. kA bleed device for the intake manifold of an internal combustion engine comprising a primary vacuum chamber in open communication with the manifold, an opening in said chamber, a closure for said opening, resilient means normally urging said closure against said opening, a secondary vacuum chamber in communication with said primary vacuum chamber through said opening, a secondary closure' providingrestricted communication between said secondary* vacuum chamber and the atmosphere, and said secondary closure being mounted in spaced relationship to the rst closure, said rst closure and said secondary closurebeing connected for simultaneous movement.

5. A bleed mechanism as set forth in claim 4 in which the engine has a carburetor provided with a throttle and in which the secondary vacuum chamber is provided with an opening, a valve normally closing said opening, and means operating synchronously with the opening of the throttle for opening said valve.

6. A bleed mechanism as set forth in claim 3 in which the engine has a carburetor provided with a throttle and in which the secondary vacuum chamber is provided with an opening, a valve normally closing said opening, and means operating lsynchronously with the openingv of the throttle for opening said valve.

7. In combination with an interna1 combustion motor, a carburetor, an intake manifold connected to the carburetor, a throttle valve between the carburetor and the manifold, a vent into the fuel passage of the carburetor, means including'a diaphragm normally closing the vent, means for applying the vacuum of the intake manifold to said diaphragm when said vacuum is above a predetermined limit, and means actuated by the preceding means for maintaining said preceding means in operation until the vacuum has fallen to a lower predetermined value, said means Vfor applying Vacuum to the diaphragm and the lastnamed means comprise a primary Valve seat communicating with the manifold, a valve normally closing the seat, a booster chamber communicating with said primary valve seat and with the diaphragm, and a secondary valve providing Ya restricted communication from the booster chamber to the atmosphere.

' CHARLES R, FLINT.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Y Date 

